Boudry, C., & Chartron, G. (2017). Availability of digital object identifiers in publications archived by PubMed. Scientometrics, 110(3), 1453–1469. https://doi.org/10.1007/s11192-016-2225-6. Article Google Scholar Franceschini, F., Maisano, D., & Mastrogiacomo, L. (2015). Errors in DOI indexing by bibliometric databases. Scientometrics, 102(3), 2181–2186. https://doi.org/10.1007/s11192-014-1503-4